Digital camera users often encounter a problem that how to choose the color space Adobe RGB or SRGB. Adobe RGB and SRGB have their own advantages. Adobe RGB has more colors that are not contained in SRGB. On the other hand, SRGB is more usual and almost all browsers support it. This article discusses on their differences, contact and conversion. According to the image processing from photographing to output, it analyzes the choice of the color space and the effects on the output image.